mod_watchdog provides infrastructure for other modules to periodically run tasks Base mod_watchdog.c watchdog_module Available in Apache 2.3 and later

mod_watchdog defines programmatic hooks for other modules to periodically run tasks. These modules can register handlers for mod_watchdog hooks. Currently, the following modules in the Apache distribution use this functionality:

To allow a module to use mod_watchdog functionality, mod_watchdog itself must be statically linked to the server core or, if a dynamic module, be loaded before the calling module.
WatchdogInterval Watchdog interval in seconds WatchdogInterval time-interval[s] WatchdogInterval 1 server config

Sets the interval at which the watchdog_step hook runs. Default is to run every second.